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Pronunciation:  `floou'resuns

WordNet Dictionary
[n]  light emitted during absorption of radiation of some other (invisible) wavelength

FLUORESCENCE is a 12 letter word that starts with F.


 See Also: autofluorescence, light, phosphorescence, visible light, visible radiation



Webster's 1913 Dictionary
  1. \Flu`o*res"cence\, n. [From {Fluor}.] (Opt.)
    That property which some transparent bodies have of producing
    at their surface, or within their substance, light different
    in color from the mass of the material, as when green
    crystals of fluor spar afford blue reflections. It is due not
    to the difference in the color of a distinct surface layer,
    but to the power which the substance has of modifying the
    light incident upon it. The light emitted by fluorescent
    substances is in general of lower refrangibility than the
    incident light. --Stockes.
  2. \Flu`o*res"cence\, n.
    A property possessed by fluor spar, uranium glass, sulphide
    of calcium, and many other substances, of glowing without
    appreciable rise of temperature when exposed to light or to
    ultra-violet rays, cathode rays, X rays, etc.
Biology Dictionary
 Definition: A term that describes any substance that emits light at a certain wavelength (emission wavelength) when it is illuminated by light of a different wavelength (excitation wavelength).
Thesaurus Terms
 Related Terms: autoluminescence, bioluminescence, cathode luminescence, chemicoluminescence, chemiluminescence, corposant, crystalloluminescence, double corposant, electroluminescence, fata morgana, fox fire, ignis fatuus, luciferase, luciferin, luminescence, luminophor, marshfire, noctiluscence, phosphor, phosphorescence, photoluminescence, radioluminescence, thermoluminescence, tribofluorescence, triboluminescence, tribophosphorescence, wisp, witch fire